UK construction is one of the most thoroughly ISO-embedded sectors in the world — driven by PAS 91 pre-qualification questionnaires, CCS construction frameworks, CDM (Construction Design and Management) Regulations 2015, and the Environment Act. For UK construction companies, the IMS bundle is effectively required to compete for any significant public sector contract.
PAS 91
Standard PQQ — ISO required
CDM 2015
ISO 45001 aligned
Net Zero
ISO 14001 relevance growing
£1,200
IMS bundle from
PAS 91 and ISO Requirements
PAS 91 is the British standard pre-qualification questionnaire used by most UK public sector clients. Standard questions include:
- ISO 9001 — quality management system (required for Stage 2 and above)
- ISO 14001 — environmental management (required for projects above £1M threshold)
- ISO 45001 / OHSAS 18001 — health and safety management
- All three together in an IMS is the most competitive positioning
UK Construction Procurement — ISO by Client Type
| Client | ISO Requirement |
|---|---|
| Local Authority (Councils) | ISO 9001 minimum; IMS for major works |
| NHS Trusts | IMS for construction contractors |
| Homes England / housing | ISO 9001 + ISO 14001 |
| Network Rail | IMS mandatory for all contractors |
| Highways England | IMS mandatory |
| Private developers (CBRE, JLL) | ISO 9001 + ISO 45001 |
Cost for UK Construction Companies
| Company Size | IMS Bundle | Timeline |
|---|---|---|
| Micro/Small (1-25) | £1,200 – £2,000 | 8-12 weeks |
| Medium (25-100) | £2,000 – £4,000 | 8-12 weeks |
| Large | £4,000 – £10,000 | 10-16 weeks |
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Frequently Asked Questions
ISO 45001 and CDM 2015 are complementary, not substitutes. CDM 2015 is UK law requiring specific duty holders and documents. ISO 45001 provides the safety management system framework that supports CDM compliance. Having ISO 45001 demonstrates systematic safety management to the HSE and clients.
ISO 14001 is not legally required for Net Zero but is strongly aligned with it. Major clients (NHS, Network Rail, Highways England) now include ISO 14001 in their supply chain sustainability requirements. For significant public sector contracts, ISO 14001 is effectively becoming mandatory.